Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.


From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search



(phycology) A taxonomic class comprised of pennate bacillariophytes (or pennate diatoms)


Bacillariophyceae is a taxonomic class comprised of pennate bacillariophytes. It was formerly placed under Phylum Chrysophyta and includes all diatoms.1 Later, van den Hoek et al. 1995 system of classification considered Bacillariophyceae as a class belonging to Phylum Heterokontophyta. However, more recent taxonomic classification regards this class as a group of pennate or featherlike diatoms and not all kinds of diatoms as what previous systems did and belongs to Phylum Bacillariophyta.2

The pennate diatoms are also referred to as featherlike diatoms because of the characteristic feather-like structural organization of their valve pattern. They have a long rib or strip of plain silica that runs along the length of the valve, opposite of the transverse ribs and lines of pores on both sides. Because of the resemblance of this strip to the longitudinal strip of the human rib cage, it was also referred to as the sternum.2 This feature makes them distinct from other clades of diatoms rather than their boat-shape since some polar centric diatoms are also shaped like a boat.

Scientific classification:

Other common name(s):

  • pennate diatom

See also:

1 Pascher, A. (1914). "Über Flagellaten und Algen ". Berichte der deutsche botanischen Gesellschaft 32: 136–160.
2 Bacillariophyceae. Retrieved from [[1]].